Intravascular angiomatosis (Masson's lesion).

Intravascular angiomatosis, also known as Massons' lesion, is a relatively uncommon, although important, tumor because it clinically mimics such benign lesions as mucocele, pyogenic granuloma, and hemangioma, as well as malignant neoplasms such as angiosarcoma and Kaposi's sarcoma. More important is the potential for misdiagnosis at the histological level that poses a significant problem to those unfamiliar with this lesion. This article reviews the literature on perioral intravascular angiomatosis and presents five additional cases.